-[NSString stringByResolvingCanonicalPath]

gistfile1.m

@interface NSString (stringByResolvingCanonicalPath)
- (NSString *)stringByResolvingCanonicalPath;
@end

@implementation NSString (stringByResolvingCanonicalPath)
- (NSString *)stringByResolvingCanonicalPath {
    FSRef fsRef;
    
    if (FSPathMakeRef((UInt8 const *)[self UTF8String], &fsRef, NULL) != 0) {
        return nil;
    }
    
    char *path = malloc(PATH_MAX);
    if (FSRefMakePath(&fsRef, (UInt8 *)path, PATH_MAX) != 0) {
        free(path);
        return nil;
    }
    
    NSString *canonicalPath = [NSString stringWithUTF8String:path];
    free(path);
    
    return canonicalPath;
}
@end